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What precisely is a
Light Year ?

A light-year is the DISTANCE which light can travel in a year. As light is fast, a lightyear is a long way! The speed of light is exactly 299,792,458 metres per second. In a year there are 60 x 60 x 24 x 365.2425 = 31,556,952 seconds. So how far is a light year? Answer: 9,460,536,207,068,016 metres. About 6 million million miles.

Other point of note: Light-Years are NOT a measure of TIME. When creating cut-price Sci-Fi it's better to make up a completely contrived unit of time that nobody's got any idea about rather than use the lightyear and risk getting ticked-off by scientists of all ages, some as young as five time-years.

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